martin-osborne 5e104addd3 Issue #297 - Implemented BasicMemoryStreamBuf::seekoff ... This change adds support for `tellp`, `tellg` and seeking. **Additional notes:** + `tellg` calls `rdbuf->pubseekoff(0, cur, out)` [lib.ostream.seeks] so need to provide an override of `seekoff`. + Requirements for `seekoff` are in 27.7.1.3. + 27.7.1.3 - Standard has a roundabout way of saying `cur` is valid if only one of `in` or `out` is specified (Condition 3). + `xend` is `egptr`/`epptr` (get area/put area). + `xbeg` is `eback`/`pbase` (get area/put area). + `xnext` is `gptr`/`pptr` (get area/put area). + `newoff` is a bit of a misnomer, the new offset into the stream is given by `newoff + off`. `newoff` is really the start point. + You can set `gnext` with `setg`, but you can't do that with `setp` you have to `pbump` by the new offset minus the current offset.		2015-01-24 18:39:06 +00:00
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Poco	Issue #297 - Implemented BasicMemoryStreamBuf::seekoff	2015-01-24 18:39:06 +00:00